Unit 3: 8051 Interfacing and Programming Question 1 (6 Marks): Explain the concept of the stack in the 8051 microcontroller and PUSH & POP. Answer: A stack is a linear data structure in which the insertion of a new element and removal of an existing element takes place at the same end represented as the top of the stack. Stack is a section of RAM used by the CPU to store the information temporarily The register used to access the stack is called the SP (stack pointer) register. The ‘PUSH’ is used for taking the values from any register and storing in the starting address of the stack pointer. POP is used for placing the values from the stack pointer’s maximum address to any other register’s address To implement the stack, it is required to maintain the pointer to the top of the stack, which is the last element to be inserted because we can access the elements only on the top of the stack. LIFO (Last In First Out): This strategy states that the element that is inserted last wil...
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